Browse Prior Art Database

COPIER/PRINTER WITH TWO DEVELOPMENT SYSTEMS OF OPPOSITE POLARITY

IP.com Disclosure Number: IPCOM000025710D
Original Publication Date: 1987-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

A copiedprinter is proposed, with each function operating separately. A tri-level development system is proposed for the machine. The two xerographic development systems would be used in independently; positive for copying, reversal for printing. The CopierPrinter would produce copies using the conventional light-lens approach which uses a normal xerographic reproduction process. The Printer function would use an LED array bar and lens to expose the photoconductor. Using a conventional xerographic development system requires writing white; that is, the LEDs are energized to discharge the photoreceptor wherever the output document is to be toner-free. Writing black, energizing the LED for the corresponding toned parts of a document, requires reversal xerography. The advantages to write black are that the LEDs are used at a much lower duty cycle which results in extending the LED print bar life; estimated to be about five times. Also, the LED power supply requirements are reduced. Using a Tri-Level development system as shown in the Figures, would yield these benefits. In copier operation, the development would occur using the positive or conventional xerography. But for the printer operation, reversal xerography would be employed.

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XEROX DISCLOSURE JOURNAL

COPIER/PRINTER WITH TWO DEVELOPMENT SYSTEMS OF US. C1.355/3DD OPPOSITE POLARITY
Lawrence J. Mason

Proposed C 1 assi fi ca ti on Int. C1. G03g 15/00

  PIR VOLTAGE

VOLTAGE

BLACK OR COLOR

1

*

TRI-LEVEL SIMULTANEOUS OPERATION

WHITE

TRI-LEVEL COPIER OPERATION

F/G. I

 BACKGROUND DISCHARGES PHOTORECEPTOR

L.E.D. DISCHARGES PHOTORECEPTOR

LEVEL

F/G. 2

I

TRI-LEVEL PRINTER OPERATION

FIG. 3

Volume 12 Number 3 May/June 1987 147

[This page contains 1 picture or other non-text object]

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COPIER/PRINTER WITH TWO DEVELOPMENT SYSTEMS OF OPPOSITE POLARITY (Cont'd)

A copiedprinter is proposed, with each function operating separately. A tri- level development system is proposed for the machine. The two xerographic development systems would be used in independently; positive for copying, reversal for printing. The CopierPrinter would produce copies using the conventional light-lens approach which uses a normal xerographic reproduction process. The Printer function would use an LED array bar and lens to expose the photoconductor. Using a conventional xerographic development system requires writing white; that is, the LEDs are energized to discharge the photoreceptor wherever the output document is to be toner-free. Writing black, energizing the LED for the corresponding toned parts of a document, requires reversal xerography. The advantages to write black are that the LEDs are used at a much lower duty cycle which results in extending the LED print bar lif...